While I had originally only considered the main three Pony Types, Earth, Pegasus, and Unicorn, I like the idea of Clockworks being not just regular ponies and having connections to the other tribes. Clockwork Seahorses would be interesting though.

Hmm. For the Passive Recal feat, you never have to sleep to regain spells, only rest. While I like the ability for multitasking, it could be beefed up a little, like the time could be used for crafting magic items or reducing the rest required to fewer hours, like a Ring of Sustenance.

In the Magic chapter, under preparing wizard spells, it states that if a character does not have to sleep, they must have 8 hours of restful calm to retain spells. While it's not doing anything else, it still isn't sleeping.